Support equation environment - Bump to 0.7.1

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+# [0.7.1] - 2024-11-18
+
+## Added
+
+- Added support for `equation` and `equation*` environments.
+
 # [0.7.0] - 2024-10-10
 
 ## Fixed

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "pulldown-latex"
-version = "0.7.0"
+version = "0.7.1"
 authors = ["Charles Edward Gagnon"]
 edition = "2021"
 description = "Pull parser to convert LaTeX equations to MathML"

src/mathml.rs

@@ -313,7 +313,14 @@
                         self.writer.write_all(b"><mtd>")?;
                         EnvGrouping::Split { used_align: false }
                     }
-                    Grouping::Equation { .. } => todo!(),
+                    Grouping::Equation { eq_numbers } => {
+                        self.writer.write_all(b"<mtable")?;
+                        if eq_numbers {
+                            self.writer.write_all(b" class=\"menv-with-eqn\"")?;
+                        }
+                        self.writer.write_all(b"><mtr><mtd>")?;
+                        EnvGrouping::Equation
+                    }
                 };
                 self.env_stack.push(Environment::from(env_group));
                 Ok(())
@@ -349,6 +356,7 @@
                     | EnvGrouping::SubArray
                     | EnvGrouping::Gather
                     | EnvGrouping::Multline
+                    | EnvGrouping::Equation
                     | EnvGrouping::Split { .. }
                     | EnvGrouping::Alignat { .. } => {
                         self.writer.write_all(b"</mtd></mtr></mtable>")
@@ -453,13 +461,22 @@
                 spacing,
                 horizontal_lines,
             })) => {
-                *self.state_stack.last_mut().expect("state stack is empty") = State::default();
+                *self
+                    .state_stack
+                    .last_mut()
+                    .expect("state stack should not be empty") = State::default();
                 self.previous_atom = None;
 
                 if let Some(Environment::Group(EnvGrouping::Array { cols, cols_index })) =
                     self.env_stack.last()
                 {
                     array_close_line(&mut self.writer, &cols[*cols_index..])?;
+                } else if let Some(Environment::Group(EnvGrouping::Equation { .. })) =
+                    self.env_stack.last()
+                {
+                    // LaTeX does _nothing_ when a newline is encountered in an eqution, we do the
+                    // same thing.
+                    return Ok(());
                 } else {
                     self.writer.write_all(b"</mtd></mtr><mtr")?;
                 }
@@ -1098,6 +1115,7 @@
     Split {
         used_align: bool,
     },
+    Equation,
 }
 
 #[derive(Debug, Clone, PartialEq)]

src/parser/primitives.rs

@@ -1668,12 +1668,12 @@ impl<'b, 'store> InnerParser<'b, 'store> {
                     }
                     "equation" => (
                         G::Equation { eq_numbers: true },
-                        u16::MAX,
+                        0,
                         GroupingKind::Equation { eq_numbers: true },
                     ),
                     "equation*" => (
                         G::Equation { eq_numbers: false },
-                        u16::MAX,
+                        0,
                         GroupingKind::Equation { eq_numbers: false },
                     ),
                     "align" => (

tests/cross-browser.rs

@@ -131,6 +131,15 @@ round_trip! {
     d + e + f
 \end{split}"#,
 }
+round_trip! {
+    equation,
+r#"\begin{equation}
+    a = b + c
+\end{equation}"#,
+r#"\begin{equation*}
+    a = b + c
+\end{equation*}"#,
+}
 round_trip_display! {
     colors,
     r"\fcolorbox{red}{blue}{\textcolor{white}{a + b = c}}"